Ray1684 wrote:Have you tried the Numen Aero Rear Light which was designed for Giant? they fit well on the aero seatpost/frames.

I have one on my Propel SL, and don't believe there are any brandings on the light itself so it should look great on the S5.

I bought one of these just to check it out... Mounts well but I wouldn't use it as a main light... Way too dull to put my life in its hands... Although I home brewed up a secure mount for around the aero seatpost, I know just just a helmet mounted light as my primary light. After trialing the RedZone 8 I don't need anything else except a backup in my pocket in case of failures...

I tried the Moon Comet but found the saddle rail on my S5 is too wide for the bracket due to the saddle position. The saddle mount on top of the post prevents the bracket from moving back far enough.So, the comet will go on the commuter bike.I got a Moon LX-70 as an alternate and it comes with rubber pads to fit aero posts. did a quick test and it looks like an almost perfect match. Will post up some pics as soon as I have put the aero pad onto the light (you need to unscrew the default pad and swap it over with one of the two others). If the fit is a bit wobbly, I will get some Sugru to make it a perfect fit.

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